例句與造句

1. Although prompt ( i . e . not beta-delayed ) proton emission was observed from an isomer in cobalt-53 as early as 1969, no other proton-emitting states were found until 1981, when the proton radioactive ground states of lutetium-151 and thulium-147 were observed at experiments at the GSI in West Germany.
2. It's difficult to find proton radioactive in a sentence. 用proton radioactive造句挺難的